Unreasonable particle trajectories and invalid wall condition

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Hello there,

I encountered some issues while using the charged particle tracing module in COMSOL. I have completed the simulation and obtained the particle trajectories. But some particles don't look very reasonable. A portion of the particles collided with my metal electrode and passed through it, but the surface of electrode was set with the wall condition "Disappear." I used a finer mesh and smaller time steps, but the situation did not improve. What method can be used to solve this problem? https://files.imagetourl.net/uploads/1764125523605-63d4c858-3ed4-435c-81b2-e9c22515c60e.png https://files.imagetourl.net/uploads/1764125843251-3ca98b26-6189-4f75-92e6-48741645ab23.png https://files.imagetourl.net/uploads/1764125873326-f694c201-f106-4f9e-811c-267e2e1d3d8d.png

Thank you all in advance.


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